CVE-2026-49416 Integer overflow in vt(4) CONS_HISTORY ioctl
An unprivileged local user can trigger an integer overflow in the FreeBSD kernel vt(4) driver to perform an out-of-bounds write and escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49416?
CVE-2026-49416 is a high-severity vulnerability in Freebsd Freebsd, published on 27 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The CONS_HISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected. Subsequent initialization of the buffer wrote beyond the end of the allocation.
An unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.
Weakness: CWE-190
Which versions are affected by CVE-2026-49416?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49416?
No fix has been published for CVE-2026-49416 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49416 being exploited?
There is no known exploitation of CVE-2026-49416 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-f3p8-j3ww-gvq7.